Mattress



FIG. 1 is a perspective view of a first embodiment of a mattress;

FIG. 2 is a plan view thereof;

FIG. 3 is a first side view thereof, the opposed side view being the same;

FIG. 4 is a front view thereof, the rear view being the same;

FIG. 5 is a perspective view of a second embodiment of a mattress;

FIG. 6 is a plan view thereof;

FIG. 7 is a first side view thereof, the opposed side view being the same; and,

FIG. 8 is a front view thereof, the rear view being the same.

The greyscale shading of the elements (white, grey and black) is intended to designate the different elements of the mattress. The mattress is shown with a symbolic break in its width. The appearance of any portion of the article between the break lines forms no part of the claimed design. 

CLAIM The ornamental design for a mattress, as shown and described. 